If you need to send emails through an e-mail address with your domain name, you have to make sure that the company will provide you with access to their SMTP server. The aforementioned is the software that allows e-mails to be sent. SMTP is an abbreviation for Simple Mail Transfer Protocol and it handles all outbound emails from applications, webmail and contact forms. Whenever a message is sent out, the SMTP server checks with all the DNS servers throughout the world where the emails for the receiving domain name are managed and when it obtains this information, it connects to the remote POP/IMAP server to find out if the recipient mail box exists. In case it does, the SMTP server directs the email body and the receiving server sends it to the mailbox in which the recipient can open it up and see it. Without an SMTP server on your end, you won't be capable to send out messages in any way.